Vertical handoffs in fourth-generation multinetwork environments
Vertical handoffs in fourth-generation multinetwork environments
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DOI：
10.1109/mwc.2004.1308935
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发表时间：
2004-06-01
影响因子：
12.9
通讯作者：
Zhu, F
中科院分区：
文献类型：
--
作者：
McNair, J;Zhu, F
4G的革命性驱动因素包括通过无缝的个人和终端移动性推动普遍的无线接入和无处不在的计算。无缝移动性的主要挑战之一是创建垂直切换协议：用于在不同类型的网络之间移动的用户的切换协议。传统的切换检测策略、决策度量和无线链路传输操作不能适应动态切换标准，也不能对用户输入和不断变化的网络可用性做出反应。它们也无法提供情景感知服务或确保网络互操作性。因此，需要新的技术来管理不同类型网络之间的用户移动性。本文介绍了在设想的第四代多网络环境中垂直切换的设计和性能问题的教程。文中描述了3G及以后的各种网络架构和技术，包括无线局域网、蜂窝、卫星和移动IP。然后，在这种多样化的网络环境的背景下定义了垂直切换问题。最后，探讨了解决尚待解决的问题的研究工作，包括动态切换判决和检测算法的新技术以及上下文感知的无线链路转移。
Revolutionary drivers for 4G include a push toward universal wireless access and ubiquitous computing through seamless personal and terminal mobility. One of the major challenges for seamless mobility is the creation of a vertical handoff protocol: a handoff protocol for users that move between different types of networks. Traditional operations for handoff detection policies, decision metrics, and radio link transfer are not able to adapt to dynamic handoff criteria or react to user inputs and changing network availabilities. Nor are they able to deliver context-aware services or ensure network interoperability. Thus, new techniques are needed to manage user mobility between different types of networks. This article presents a tutorial on the design and performance issues for vertical handoff in an envisioned multinetwork fourth-generation environment. Various network architectures and technologies for 3G and beyond are described, including wireless LANs, cellular, satellite, and Mobile IP. Then the problem of vertical handoff is defined in the context of such a diverse network environment. Finally, research efforts to resolve the open problems are explored, including new techniques for dynamic handoff decision and detection algorithms and context-aware radio link transfer.